MICROWAVE 320 Position & Level Control - · PDF fileMICROWAVE 320 Position & Level Control ... Delavan’s model Microwave 320 is a single point electronic switch for ON/OFF....

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MICROWAVE 320Position & Level Control

An L&J Technologies Co.5911 Butterfield RoadHillside, IL 60162Phone: 708-236-6000Fax: 708-236-6006

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Visit L&J Technologies on the internet at www.ljtechnologies.com

Sonac 320 Upgrade KitInstallation Instructions

The new upgraded unit is not only smaller, but also equipped with connectors for easy PCB field replacement.In addition, an internal quick-test feature has been added to help verify proper operation.

Step 1: Locate and verify all shipped parts.

1-New Sonac 320 amplifier PCB.1-New label2-Terminal block plug connectors.1-Manual

Step 2: Turn off power to the unit.

Step 3: Remove the cover from the base by unscrewing the four retention screws.

Step 4: Remove and discard the old Sonac 320 amplifier Printed Circuit Board (PCB). Simply grab the PCBcard ejectors toward the inside of the PCB and pull up and out.

Step 5: Remove and discard old PCB card guides by removing the single screw located in the base of eachcard guide.

Step 6: The connections to the new Sonac 320 amplifier PCB are the same as the old Sonac 320motherboard PCB. Instead of using screw terminal blocks that attached directly to the PCB, twopush-on terminal blocks are used. These terminal blocks mate to a plug connector wired to yourexternal facilities and sensors. One plug terminal is labeled 1 thru 10 and the other 11 thru 20.These numbers correspond to the same numbers as on the old Sonac 320 motherboard. Take theplug connectors supplied in the kit and attached to the existing wiring. See manual (D42065) ifunsure of wiring.

Step 7: Remove and discard the old Sonac 320 motherboard. First remove and discard the two screws oneither side of the black PCB connector. Next note the location of the three remaining motherboardmounting screws. The new Sonac 320 amplifier PCB will use the same mounting locations. Removethese screws and save.

Step 8: Mount the new Sonac 320 amplifier PCB into the base using the three screws you saved and thelocations you noted in step 7.

Step 9: Insert the plug connectors into their respective terminal blocks. Verify proper connections andcalibrate as outlined in manual (D42065).

Step 10: Place the new label on the inside of the cover, on the side closest to the three knockouts. Makesure to center the label before adhering to the cover.

Step 11: Place the cover back on the base and tighten down the four retention screws.

Step 12: Assembly is complete.

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TABLE OF CONTENTS

Page(s)1.0 Introduction ...................................................................................................... 4

1.1 Description ................................................................................................... 41.2 Principle of Operation ................................................................................... 41.3 Typical Applications ...................................................................................... 41.4 Ordering Information ..................................................................................... 5

2.0 Product Specifications .................................................................................... 52.1 Dimensions .................................................................................................. 52.2 Sensors (Transmitters & Receivers).............................................................. 6

3.0 Mounting & Wiring............................................................................................ 73.1 Unpacking .................................................................................................... 73.2 Mounting Location ........................................................................................ 73.3 Electrical ...................................................................................................... 73.4 Relay Wiring Truth Table ............................................................................... 8

4.0 Installation......................................................................................................... 84.1 Object Detection ........................................................................................... 84.2 Level Control ................................................................................................ 8

5.0 AdjustmentControls ......................................................................................... 95.1 Relay and Sensor Status............................................................................... 95.2 Strap and Potentiometer Function ................................................................. 9

6.0 Calibration......................................................................................................... 9

7.0 Alignment with Windows ................................................................................. 10

8.0 Differential Voltage ........................................................................................... 10

9.0 Troubleshooting ............................................................................................... 11

10.0 Spare Parts ..................................................................................................... 12

11.0 Return Goods (RG) Policy ............................................................................. 12

12.0 Product Warranty ........................................................................................... 12

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1.0 INTRODUCTION

The contents in this instruction manual are designed forDelavan’s model Microwave 320. Please review theinformation contained in this instruction manual carefully toensure proper operation.

1.1 Description

Delavan’s model Microwave 320 is a single point electronicswitch for ON/OFF action. It can be used for level control aswell as detection of objects. This sensing principle can “see”through windows that are transparent to microwave energy.This makes the Microwave 320 especially useful forapplication on very aggressive as well as hot products asthe sensors do not have to come into direct contact with theprocess material. Typical system shown in (Figure 1) below.

Figure 1

1.2 Principle of Operation

These controls are non-contact, microwave based controls.The transmitter (source) consists basically of a powersupply, pulse modulator, Gunn oscillator, and directionalantenna. The receiver consists of a directional antenna, amicrowave mixer cavity with a Schottky barrier diode detector,a high gain, low noise amplifier, a pulse coding network, avoltage comparator circuit, and a relay driver circuit.

In the transmitter, power is converted to a well regulatedand filtered 12 VDC supply. It is then pulsed at about 1 KHzby the pulse modulator circuit. This circuit is included topermit pulse discrimination circuitry to be used. In addition,pulsing at a 10% duty cycle safely permits peak transmittedpower levels 10 times greater than permitted undercontinuous wave operation.

The pulsed DC is fed to a Gunn oscillator in the antennaassembly, where the 12 VDC, 1 KHz square wave isconverted to a pulsed X band (10.525 GHz) microwavesignal. The signal is radiated by the directional antenna,which is typically a 10 dB gain horn with a beam angle ofapproximately 40°.

In the receiver, the signal is received by a directional antennaand coupled to a mixer cavity containing a Schottky detectordiode. This diode converts the low level microwave signal

to a low level pulsed DC, which is then amplified by anadjustable gain - low noise IC amplifier to a 0-10 VDC controlsignal.

This system is interconnected and uses pulsediscrimination coding. In these systems the receiver is ononly when the transmitter is on, thus the system is virtuallyimmune to false triggering from stray microwaveinterference. The level of the amplified received signal (0-10 VDC) is compared with a preset value in a voltagecomparator circuit. When the signal received exceeds thecomparator setpoint, an output signal is initiated which isprocessed through time delay circuits to drive the outputrelay.

Materials in the industrial environment have various effectson microwave signals. For example, low level microwavescannot penetrate metals, but are reflected by them. Theyare absorbed almost entirely by water, and to varyingdegrees by water based solutions or products that have asignificant moisture content such as grain, wood products,etc.

Transmission losses increase with increasing dielectricconstants and increase with increasing conductivity. Forexample, air (dielectric constant of 1 and conductivity of zero)transmits microwave with no loss while sea water (dielectricconstant of 55 @ X-band and conductivity of 4 mhos/meter)provides extreme attenuation of the microwave energy. It isthe material’s dielectric constant and conductivity thatdetermine whether or not the material is a good candidatefor microwave control.

1.3 Typical Applications

Level control of liquids or solids in tanks, bins, hoppers orchutes are some typical applications. Non-conductivefiberglass tanks represent minimal losses to X-bandmicrowaves. The microwave sensors are mounted on theoutside opposite one another on the tank. Losses throughthe tank walls and air vapors above the product are low.When the product level reaches the control position, thesignal is attenuated significantly, causing the output relay tochange state.

Metal tanks or hoppers must have a “window” transparentto microwave signals. Sightglasses (3”-4” dia.) can be usedon liquid storage tanks, compatible with the pressures,temperatures and chemical properties of the materialsstored in the tank. For metal vessels storing solid materials,“windows” can be constructed of materials compatible withthe product contained therein. See Windows page 7.

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1.4 Ordering Information

Microwave 320 - - - -___

Interconnection Cable P50 = Pair of 50 ft. PVC Cables,

2 Conductor P100 = Pair of 100 ft. PVC Cables

2 Conductor B = Bulk PVC Cable, 2 Conductor

(Lengths over 100ft.) T = Bulk Teflon Cable, High Temp

(300 ft. or Less) 00 = None

Mounting Options (per pair)W = Standard, 2 ½” C.S. Weldment for 851’sU = 4” C.S. Weldment with UHMW windowT = 4” C.S. Weldment with Teflon windowF = 4” C.S. Weldment with Firebrick

(750° F max)G = 2” Weldment and Quartz Glass Window

(400° F max)H = High Temp, 4” Lagging Extension

for 851’sA = High Temp, Angled Weldment for

Fly Ash ApplicationsE = High Temp, 12” Lagging Extention for

Fly Ash Bracket00 = None

Sensors Type (priced per pair)851 = Standard, C.S. direct coupled 2 -½” NPT811 = NEMA 12, 3.9” x 3.8” x 6.6” Enclosure

with Extention

801 = NEMA 4X,3.9” x 3.8” x 6.6” Enclosure861 = High Temp, Water-Cooled, (750° F max.)851S= 316 Stainless Steel, Direct Coupled, 2-1/2” NPT851V= Vibration Resistant 851’s841 = NEMA 12, 3.9” x 3.8” x 6.6” Enclosure

with Extension and Horn

Note:801, 811, 841, 851, 851S, 851V----140 F max for Electronics

Enclosure TypeS = Standard, NEMA 4X EnclosureC = Clear Cover, NEMA 4X EnclosureO = OEM, Electronic Assembly with Mounting Hardware

(No Enclosure)T = Standard, NEMA 4x enclosure with external Self-test

option.D = Clear cover NEMA 4x enclosure with external Self-

test option.Model Microwave 320 Point Level Switch

2.1 Dimensions

2.0 PRODUCT SPECIFICATIONS

°

Supply Voltage Nominal Absolute Limits 115 VAC 95-135 VAC 24 VDC 20-26 VDC 231 VAC 190-270 VAC

Frequency, AC Power 50-60 Hz 45Hz MinimumPower Consumption 5 VAOutput & Ratings Relay, Form C contacts

DPDT 5 amp @ 120 VAC Resistive 3 amp @ 240 VAC Resistive 3 amp @ 24 VDC Resistive

Time Delay Independent with Auto Reset on make, or break

Time Delay Range Minimum = 50 milliseconds Maximum = 30 seconds Nominal = 10 Seconds

Fail-safe Switch selectable - High level or Low level

Operating -40 F to +160 FTemperature (Elect.) (-40 to +71 C)Maximum PVC 1000 feet (304.9M)Cable Length Teflon 300 feet (91.4M)Sensor Mounting 2 1/2 NPTSensing Range Minimum =6 inches (15cm)

Maximum = 100 feet (30.5 M)Enclosure Rating NEMA 4X

Watertight, corrosion resistant

Electrical Specifications

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2.2 Sensors (Transmitters & Receivers)

Long range transmitting/receiving Standard Servicesensors with 10 dB gain horn anten- Object detection, railroad carnas. Maximum range 100’ in air. detection & positioning. LiquidNEMA 4X enclosures. MT801/MR801 level control, bin level controltemperature range: -20º F to +140º F (sand, rock, asphalt, coal, cement,(-30º C to +60º C). fly ash, etc.) use with Part #41121

window.

Short Range accurate high/low level High/low level detection, emptydetection. Range up to 10’ in air. bottle detection, battery filling levelUsed primarily for accurate position control, empty box detectionand level sensing of bottle, small boxes, ect. counting, short range pluggedNEMA 12 enclosures. chute.Temperature range: -20º F to +140º F

(-30º C to +60º C).

Identical to MT801/MR801 except Severe Service. Bin level controlsensors are constructed in 2 ½” of sand, rock, asphalt, coal, etc. insteel pipe. Designed to be screwed areas where physical abuse ofdirectly into vessels using 2 ½” sensors is possible. Rugged.weldment(P/N 1249 - order separately).Window material is FDA approvedUHMW polyethylene 1” thick.Contact factory for other availablematerial. Temperature range:-20º F to +140º F (-30º C to +60º C).

Similar to MT811/MR811 except10 db gain horn antennas are used.Designed to be used in Part No.41105-X, waveguide extension kit.Maximum range 100’ in air,Enclosures is NEMA 12. When usedwith 41105-X, maximum temperature isat antenna is 600ºF (313ºC). Amplifiermaximum temperature is 140 F (60ºC).

Waveguide with 10db gain hornantenna. Level control when vesselor environment is extremely hot.Furnaces, kilns, cupolas, fly ash,furnance fluidized beds, etc. Usewith Part #41121, #41213 and withcastable refractory materials.

MT801/MR801

MT811/MR811

MT841/MR841

MT851/MR851

MT861/MR861

Sensor & Model No Description Typical Applications

Similar to MT851 and MR851except waveguide 10 db horn andelectronics is located inside watercooled jacket.

Hot product, water cooled levelcontrol of limestone, ores, andother products contained infirebrick enclosures.

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3.0 MOUNTING & WIRING

3.1 Unpacking

Normally the sensors and the control unit are packedseparately. The type of sensors used are dictated by thespecific application. Unpack the sensors and compare themodel number to the specifications shown on (page 5) toconfirm they meet your application requirements.

Unpack the control unit and check the nameplates againstthe packing list before destroying any packing material.

3.2 Mounting Location

Control UnitDelavan’s Microwave 320 electronic control unit is designedfor field mounting in wet, corrosive environments. Goodinstallation practice is to mount the unit in an accessiblelocation, as free as possible from vibration, temperatureextremes, and corrosive vapors, where it is protected frommechanical damage. In wet service areas, to preventmoisture accumulation in the enclosure, conduits shouldenter the enclosure from below.

SensorsThe Microwave 320 sensors are supplied as transmittersand receivers. Their installation is dictated by the type ofsensor used. With the exception of the MT851/MR851, thesensors generally use a mounting plate Delavan P/N 41347shown in (Figure 2) below.

Figure 2

Model 851’s, 861’s, & 801’s will have arrows on both thetransmitters and receivers. When mounting these models,alignment of the arrows is critical. Line arrows so they bothpoint in the same direction or at 180° of each other. If forsome reason the arrows have worn off, are not visible, orare missing, lining up 851 or 861 sensors with the conduitopenings facing the same direction or at 180° of each otherwill also ensure proper alignment.

Model 811’s & 841’s will have rectangular waveguides orhorns. When mounting these models make the long side ofthe horns or waveguides of each sensor parallel with eachother.

WeldmentsThe MT851/MR851 system requires the use of a mountingweldment Delavan P/N 44183 shown in (Figure 3) below.

Figure 3

When installing microwave weldments (Delavan P/N 44183)in a vessel, install a cast iron pipe plug in the weldment toavoid distorting the weldment during welding. Remove thepipe plug and install the window, or sensor, with Teflon tapeor a suitable lubricant to prevent galling and ease removal,should it become necessary.

NOTE: DO NOT USE a 2 ½” NPT half coupling as this type ofconnection will form a pocket to collect product, that willcause inaccuracies.

WindowsThe Microwave 320 system can see through non-metallicwindows. The windows can be made by the user or suppliedby Delavan. Some materials that act as windows are:

MAGNESIUM FIREBRICK NYLON PARAFFINPOLYETHYLENE POLYSTYRENE GLASS (no lead)TEFLON LUCITE LEXANQUARTZ FIBERGLASS PLEXIGLASSPVC STYROFOAM MICA

3.3 Electrical

Power and relay wiring should comply with NEC (NationalElectrical Code) standards and specifications. Whenselecting wire for power and relay connections use a lightgauge, 16 to 20 AWG insulated wire.

Power Wiring1. Make certain power is disconnected.

2. Run power wires through conduit.

3. Connect the hot wire to the appropriate terminal, 115 VACto #3, 230 VAC to #4, or 24 VDC to #16. Connect thecommon wire to terminal #2 when using 115 or 230VAC. When using 24 VDC connect the common to #17.Connect an earth ground wire to terminal #1.

(see Board Layout on page 8.)

16.0(406.4)

5.875(149.2)

1.468(37.3)

2.937(74.6)

4.00(101.6)

.188(4.8)

1.00 Typ.(25.4)

3/16”

1”

3-3/16” DIA

3/32’’

4-1/16’’

3-5/16’’

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Board Layout

Cable SplicingIf an installation requires longer sensor cables, approvedcable and splicing connectors should be used. Contactfactory for the proper cable and connectors. Prepare sensorcables for terminal connection with maximum unshieldedlength as shown in (Figure 4) below.

Figure 4

If permitted by applicable electrical codes, the transmittingsensor lead may be run in the same conduit as the powerwiring. NEVER LOCATE THE RECEIVING SENSOR LEADSIN CONDUIT WITH OTHER LEADS, (except in multiple unitinstallations, leads of other receiving sensors can be runtogether).

3.4 Relay Wiring Truth TableLOW FAIL-SAFE POSITION

M/W 320ON BOARD BEAM BLOCKED BEAM CLEAR

COMPONENTSRED LED OFF ON

YELLOW LED ON OFFRELAY ENERGIZED DE-ENERGIZED

RELAY C. to N.C. OPEN CLOSEDRELAY C. to N.C. CLOSED OPEN

HIGH FAIL-SAFE POSITIONM/W 320ON BOARD BEAM BLOCKED BEAM CLEARCOMPONENTS

RED LED OFF ONYELLOW LED OFF ON

RELAY DE-ENERGIZED ENERGIZEDRELAY C. to N.C. CLOSED OPENRELAY C. to N.C. OPEN CLOSED

Relay WiringThe relay contacts are form C Dry Contacts. Power must besupplied to the relay contacts, typically, by using a jumperbetween the power terminal and the common terminal ofeach relay that is used.

4.0 INSTALLATION

4.1 Object Detection

Use the shortest possible air path between the transmitterand receiver. Place the receiver sensor as close as possibleto the object to be detected.

4.2 Level Control

When the Microwave 320 system is used for level control,sensor installation is dependent on the type of sensor usedas well as whether or not a window is used.

When the Microwave 320 system is used for level sensing,the sensors should be located so that they are buried(covered), when the system should see high level. If theproduct is granular and a repose angle exists, the sensor’slocation should be at the bottom of the pile.

NOTE: DO NOT attempt to see the top of the cone as “bounceor reflections” can cause false signals.

3/16”

1”

5.0 ADJUSTMENT CONTROLS

5.1 Relay and Sensor Status

Relay Status:YELLOW LED: Illuminates when the relay is energized.

Sensor Status:RED LED: Illuminates when the microwave path is made(beam not blocked condition).

DELAVAN

FIGURE 5

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6.0 CALIBRATION

Step 1 - Determine the fail-safe mode required for yourapplication. The fail-safe switch determines if the relay isenergized when the object to be detected is present (pathbroken) or absent (path made).

Relay De-Fail-safe Fail-Safe Strap Position EnergizedHigh Level 1 & 2 when path

is blocked

Low Level 2 & 3 when path is clear

Step 2 - Double check all wiring connections, apply powerto the unit, and place the gain select strap in position 1 & 2(high gain). Path between sensors should be clear (noproduct or object present).

5.2 Strap and Potentiometer Function

Fail-safe StrapThe fail-safe strap determines if the relay is energized whenthe object to be detected is present (path broken) or absent(path made).Fail-safe high or fail-safe low does not indicate the physicallocation of the sensor installed in the vessel.

Time DelayThe Microwave 320 control unit has two independentlyadjustable time delays. Delay on “beam make” and on“beam break.” Two potentiometers set the delay time.

Gain ControlA multi-turn potentiometer is furnished to match the ampli-fier gain to the application conditions. Clockwise (CW) rota-tion facing the gain potentiometer increases the gain.

Gain Select StrapA three position strap is used to control receiver gain.

Self TestThe Microwave 320 is equipped with a self test circuit.Pressing the momentary switch located on the far right ofthe board will activate it. (Optional external switch is alsoavailable.) Pressing either switch will force the Microwave320 to evaluate an altered receiver sensor signal. Thiswill toggle the RED and YELLOW LED states.

Step 4 - While counting the number of full turns, slowlyrotate the gain potentiometer clockwise (CW) until the REDLED comes ON. If it comes ON in less than three (3) fullturns, place the gain select strap to (low gain). The REDLED indicates the Microwave path is made. NOTE thenumber of turns at this setting.

Step 5 - Place the object to be detected in the beam orincrease the product level to cover the sensors. The REDLED should go OFF. Continue to slowly rotate the gainpotentiometer clockwise (CW) counting the total turns untilthe RED LED comes ON, or the potentiometer is rotated afull 18 times.NOTE the number of turns.

Step 6 - Rotate the gain potentiometer counter-clockwise(CCW) to a point midway between settings recorded inSteps 4 & 5.

Step 7 - The self test circuit can now be verified. First makesure the air path between the two sensors is not blocked.Pressing either the internal or external self test switch willtoggle the RED and YELLOW LED states. If either LED failsto change state then a problem exists in the Microwave 320.See section 9.0 for troubleshooting hints.

Step 8 - The Microwave 320 is provided with two time delayadjustments, delay on “beam make” and delay on “beambreak.” Choose your time delay setting from the applicationslisted below.

Bi Level ControlNormally requires both time delays to ensure that aturbulence upper level will not cause a false trip. Clockwiserotation of beam make or beam break increases time delay.

Plugged Chute ControlThese applications will normally require delay on beambreak so that falling material will not trip the control relayprematurely.

Starvation ControlWill require a delay on beam make so that when productceases to flow (starvation) the relay will not operate untilsome reasonable time period has elapsed. This preventsfalse signals due to temporary reductions in flow.

Object Detection ControlSuch applications as vehicle washing equipment requireabout 1/2 second delay on beam make and beam break toprevent false signals.

Step 3 - Turn the Make and Break Delay potentiometers fullycounter-clockwise (CCW). Next turn the Gain potentiometercounter-clockwise (CCW) at least 18 times. All threepotentiometers are now set to their minimum values. TheRED LED should not be illuminated.

Gain Level Gain Select Strap PositionHIGH 1 & 2LOW 2 & 3

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7.0 ALIGNMENT WITH WINDOWS

On applications using external windows and microwavetransparent materials acting as windows, it is necessary toadjust the distance between the sensor face and the“window”.

Step 1 - During installation, provide for a half inch movementof the sensors along the axis of the path between thesensors.

Step 2 - Connect a DC voltmeter to analog terminal #14,and ground to terminal #1.

Step 3 - Energize the system with the material to be sensedabsent from the path.

Step 4 - Adjust the gain control to obtain a reading of 4 volts.

Step 7 - Repeat procedure with the other sensor.

Step 8 - Lock each sensor in place. This position will notrequire readjustment unless the “window” characteristicsor sensors are changed.

Step 9 - Proceed with normal gain setting in accordancewith 6.0 CALIBRATION.

Step 10 - During this procedure and on all gain settingadjustments, it is beneficial to advance both time delay

adjustments to max. (CW) and ignore the relay function.

8.0 DIFFERENTIAL VOLTAGE

Through the use of a digital voltmeter, a Differential Voltagereading may be obtained. This reading can be used tosimulate what the Microwave 320 is actually seeing throughvoltage measurements. By connecting the positive (+) leadof the voltmeter to the Analog Output on the 320 board andthe negative (-) lead to shield of either the transmitter or thereceiver cable or ground, a voltage reading

may be obtained. The maximum power, or optimumcalibration voltage, is approximately 10 volts. If the readingis less than 10 volts, this may indicate either an obstructionbetween the two sensors or that the gain potentiometer isset too low for the application.

NOTE: Please refer to Board Layout on (page 8) for layout

and terminal information.

Step 6 - Rotate the gain potentiometer counter-clockwise(CCW) to a point midway between settings recorded inSteps 4 & 5.

Step 5 - Place the object to be detected in the beam orincrease the product level to cover the sensors. The REDLED should go OFF. Continue to slowly rotate the gainpotentiometer clockwise (CW) counting the total turnsuntil the RED LED comes ON, or the potentiometer isrotated the full 18 turns.NOTE the number of turns.

RED LED OFF RED LED ON

BEAM CLEARBEAM BLOCKED

0 1 2 . 5 4 5 6 7 8 9 1 0

AVERAGE VOLTAGEW/NORMAL BUILDUP

TRIP POINT

VOLTAGE SCALE

MIN.POWER

MED.POWER

MAX.POWER

OPTIMUM CAL.VOLTAGE

DC VOLTS, 20 VOLT SCALE

+ LEAD TO TP ON TOP OF 320 BOARD- LEAD TO EITHER SHIELD CONNECTION TERMINAL 13 OR 18

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9.0 TROUBLESHOOTING

Problem Probable Cause Remedy1. Unit not functioning as described. 1. No power to unit, or power 1. Make sure power is reaching main

exceeds absolute limits: terminal block; that wires are connected 95-135 VAC properly; power is within absolute limits. 180-270 VAC 20-26 VDC

2. Power to unit, but signal is not 2a. Gain potentiometer setting is too 2a. Adjust gain potentiometer.received (RED LED OFF). low.

2b. Receiver malfunctioning. 2b. If the receiver diode fails, no signal isreceived. (Consult Factory)

2c. Transmitter placement relation 2c. Move transmitter either in or outto side of vessel wrong, causing out of slightly (+1/2 inch). Connect a voltmeterphase reflections. to analog output and ground and

adjust transmitter placement formaximum voltmeter reading (0-10 VDC).

3. Relay remains unchanged when 3a. Reflections. Beam reflects from 3a. Place an object directly in front of thebeam is broken. unrelated surfaces; provides as path transmitting sensor. If relay changes,

around object in the beam. then reflections may be a problem.

3b. Microwave passes through objects 3b. Check as in 2a. Readjust gainbecause of microwave transparency potentiometer.

3c. Electrical signals may be passing 3c. Examine cables. Makes sure that thefrom one cable to another creating an receiving sensor cables are not run with auxiliary path. power, transmitting, or control wires.

Repair unshielded poor cable splices.Run transmitting and receiving cables inseparate conduit and check forinsufficient cable shielding at terminalconnections. ( See Figure 4 & 5)

3d. Defective 320 board 3d. Plug in spare amplifier to check this.

4. Intermittent operation. 4. Usually results from two or more 4. Follow all the procedures in (step 3) tocauses in step 3. While one alone isolate and correct potential cause ofmight not affect operation, adding a intermittent operation.2nd or 3rd might decrease path sototal loss between sensors is less thanamplifier gain.

5. External device, that is wired to 5. System components other than the 5. Check microwave relay contacts andrelay terminal, does not function. Microwave 320 may be defective; external device. Wire power to relayStatus LED's indicate operation. relay contacts burned or external contacts.

device defective. No power at relaycontacts.

6. Self Test failure. 6. Either of the two sensors or the PCB. 6. Self test verifies the integrity of the whole system. Review all problems in this sectionto isolate the particular failure.

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10.0 SPARE PARTS

11.0 RETURN GOODS PROGRAM

When returning equipment to Delavan, it is necessary tofirst obtain a return goods authorization (RMA) number.In order for Delavan to provide the most efficient serviceregarding any equipment being returned, the followinginformation is necessary:

1) Billing & shipping addresses

2) Contact name & phone number

3) Reason for return

4) Purchase order number (for repairs)

5) Brief, but detailed, description of the problem or reason for return.

Authorization may be obtained by contacting eitherDelavan or your local Delavan representative.

12.0 PRODUCT WARRANTY

Delavan level control products will be replaced, put in goodoperating condition, or the purchase price refunded, at theoption of Delavan, free of charges except transportation, ifdefective in their manufacture, labeling, packaging, orshipping, and if notice of said defect is received by Delavanwithin one year from the date of shipment. The cost of suchreplacement repair or refund or purchase price shall be theexclusive remedy for any breach of any warranty, andDelavan shall not be liable to any person for consequentialdamages for injury or commercial loss resulting from anybreach of any warranty, of fitness for a particular purpose,and makes no other warranty, express or implied, includingimplied warranty arising from course of dealing or usage ortrade.

FM Approved:Class II, Groups E, F & GDivision 1 HazardousLocations

CSA Approved:Class II, Groups E, F & GHazardous Locations

Third Party Agency Approvals

5911 Butterfield Rd.Hillside, IL 60162PH: (708) 236-6000FAX: (708) 236-6006E-MAIL: [email protected]

Revision 2.0 5-30-06

DESCRIPTION PART NUMBER320 Final Assembly D42076320 Electronic Assembly D42564320 Enclosure Gray D44151320 Enclosure Clear D44152320 O.E.M. Mount Frame D42806320 Weldment 2 1/2" C.S. D41249-2320 Weldment 2 1/2" C.S. D41249-4320 Mounting Plate D41347320 Firebrick Window D43681320 Cable, Bulk - PVC D12667320 Cable, Bulk - Teflon D442432320 MR 801 Receiver D42944320 MT 801 Transmitter D42943320 MR 811 Receiver D42956320 MR 811 Transmitter D42955320 MT 851 Receiver D42941320 MR 851 Transmitter D42940320 MR 861 Receiver D42924320 MT 861 Transmitter D42923320 Instruction Manual D42065